Henry Bradford Washburn, Jr. was an American explorer, mountaineer, photographer, and cartographer. He established the Boston Museum of Science, served as its director from 1939–1980, and from 1985 until his death served as its Honorary Director. Bradford married Barbara Polk in 1940, they honeymooned in Alaska making the first ascent of Mount Bertha together.
Washburn is especially noted for exploits in four areas.
He was one of the leading American mountaineers in the 1920s through the 1950s, putting up first ascents and new routes on many major Alaskan peaks, often with his wife, Barbara Washburn, one of the pioneers among female mountaineers and the first woman to summit Denali.
He pioneered the use of aerial photography in the analysis of mountains and in planning mountaineering expeditions. His thousands of striking black-and-white photos, mostly of Alaskan peaks and glaciers, are known for their wealth of informative detail and their artistry. They are the reference standard for route photos of Alaskan climbs.
He was responsible for creating maps of various mountain ranges, including Denali, Mount Everest, and the Presidential Range in New Hampshire.